Heald shaft motion for hand looms



Aug. 13, 1946.

P. FLORJANCIC ETAL 2,405,732 HEALD SHAFT MOTION FOR HAND LOOMS File dDec. 7, 1944 Patented Aug. 13, 1946 UNITED STATE HEALD SHAFT MOTION FORHAND LOOMS Peter Florjancic and Emil Boral, Zurich, Switzerland,assignors to Max Bucher, Zurich, Switzerland Application December 7,1944, Serial No. 567,058 In Switzerland July 26, 1943 Claims. (Cl.13932) I This invention relates to heald shaft motions for hand looms.

In hand 1ooms the number of eccentrics and pedal levers required for theactuation of the heald shaft motions depends upon the number of healdshafts provided, the latter number depending in turn upon the weaveto beproduced, that is, t he number of threads to be differently inserted inthe repeat of pattern of the weave.

In contrast to the conventional mode of procedure, in the heald shaftmotion for hand operated looms, according to the present invention, aplurality of shaft actuating lifting members are turned by a singlereciprocatory control lever.

By this means the construction and the opera-j tion of the heald shaftmotion is simplified, thereby to simplify the attendance and to increasethe efilciency of working. An embodiment of the invention is illustratedby way of example-only in the accompanying drawing in which I Fig. 1shows a heald shaft motion according to the present invention inelevation;

Fig. 2 shows a partial top plan view of Fig. 1; Fig. 3 shows a part ofthe heald shaft motion in side elevation on a larger scale;

Fig. 4 is a horizontal section of Fig. 3;

,Fig. 5 is a view of one of the ends of a shaft, and

Fig.6 shows supporting means for the shaft in a longitudinal section.

As shown in Figs. 1 and 2, in the frame of the loom on two-lower rods land 2 extending parallel to each other, two carriers 3 which extendtransversely of said rods are supported and have arranged thereon apivot 5 by means of bearings 4. On the pivot 5 four lifting cams 6, 1, 8and 9 are mounted which are united into a block and are connected to theshaft 5 by means of a key l9 for common rotation therewith. With each ofthe four lifting cams 6 to 9 which have a form similar to a quadrant andare all relatively offset at angles at the center of 90 individualactuating rods H to M respectively cooperate.

The four actuating rods H to M provided are swingably mounted at one oftheir ends on a bolt l5 which is arranged in common with said rods andis secured to both carriers 3. The other ends of said rods are eachconnected by means of a cord drive is with one of four shafts l! to 28respectively, in a known manner.

Each of said shafts I! to 28 which, as shown in Fig. 5, carry healds 22by means of two shaft staves 2|, carries on both of its ends astationary supporting bar 23 for interengagement with a tubular guide 24the lower end of which is closed and which houses a helical spring 25(Fig. 6).

By means of its two supporting rods 23 each shaft is resilientlysupported on the springs 25 in the two respective guide tubes 24. Thefour guide tubes 24 that are situated at adjacent ends of the shafts I!to 20 are welded together with a common connecting rod 26 of the loomframe. The numeral 21 refers to the slay which is swingably arranged bymeans of slay swords 28 in a manner known per se and carries the reed29. The numerals 38 and 3! denote warp threads arriving-from the Warpbeam 32. The-cloth beam is referred to. as .33. I

. Ontheshaft 5 carrying the cams 6 to 9 is further arranged a sprocket34 the rim of which is secured to a hub portion 35 which is connectedfor rotation with the pivot 5 by a key l8. Between the hub portion 35and the sprocket rim balls 36 are included so as to form together withsaid parts a unidirectional coupling, that is, a free wheel hubarrangement. About the rim of the sprocket 34 passes a chain 31 one endof which is attached to a tension spring 38 and the other to a two-armedpedal lever 39. The other end of the tension spring 38 is hooked to ahook 48 which is-fastened onone of the carriers 3. The pedal lever 39 ismounted on the rod 2 and is provided on its lower side with a, set screw4| which serves as a stop for limiting the throw of the pedal lever 39by hitting the floor as'this lever moves in the corresponding direction.A set screw 42 arranged on one of the carriers 3 serves as an abutmentfor limiting the throw of the pedal r lever 39 in the other direction ofmovement.

The operation of the loom is as follows:

By depressing the pedal lever 39 in the direction of the arrow shown inFig. 1 the pivot 5 is accordingly turned by action of the chain 31 andconsequent stressing of the spring 38, due to the coupling formed by thewarp beam then becoming efiective. By way of example it is assumed thatthe cam 6 is thus rendered operative whereby the associated shaft ismoved downward against the influence of the pair of springs 25.

sociated shafts are obviously moved downward. As the individual cams 6or I, 8, 9 respectively are rendered inoperative the associated shaftsreturn into their upper positions by influence of the associated pair ofsprings 25.

In the present instance the pivot carrying the cams B to. 9 hasperformed one revolution after having been controlled four times bymeans of the pedal lever 39. If a lesser or greater number of cams isprovided the throw of the pedal lever 39 is accordingly adjusted togreater or smaller range. Naturally, the angular ranges of the camsabout the pivot 5, that is, said ranges of the cams relatively to eachother, may be adjustable. The point at which the tension spring 38 isattached to the loom frame may, if desired, be adjustable, for exampleby means of a sliding member.

The possibility of moving all of the shafts o groups of shafts as awhole through the intermedia ry of a single pedal lever simplifies thework of the attendantperson to a great extent compared with theconventional mode of using both feet for the pedal lever control so thatin the event that more than two pedal levers are provided the levercontrol even requires the feet to be dislocated. In the heald shaftmotion according to the present invention the attendant person maycontrol the pedallever w'ith either foot as desired, and in connectiontherewitnthe heel or the front of the feel: may abut against or besustained by the floor respectively.

'The relief obtained for the attendant person by means of the healdshaft motion according to the -present invention enables-this person toattend 'to the other work, that is, to the 'weaving operation properwith more concentration of mind and economy of physical strength inconsequence whereof the efi'icienc'y of weaving is increased.

The heald shaft "motion according to the pr esent invention requiresrelatively little space and cost of manufacture, due to being ofsimpleconstruction, and since the weight bf its movable parts can bekept down the operation of this heald shaft motion "can be -efiectedwith little effort. owing to the iact that the slay is -Stip-' ported,that is, mounted in hearings at its lower position, and also "for otherreasons uppe'r top mountings are avoided, a loom devoid of -'a top 1. Ina heald drive means for hand looms, a common cam shaft having aplurality of heald controlling cams mounted thereon, a plurality ofheald shafts each corresponding to one of the cams respectively, asingle pedal, means connecting the pedal with the cam shaft foroperating the cam shaft always in the same direction, and a springconnected with the shaft operating means so as to be stressed by theactuation of the pedal.

2. A heald drive means for hand looms as defined in claim 1, and havingmeans for adjusting the stroke of the pedal.

3. In a heald shaft motion for hand looms, a plurality of heald shafts,a rotary lifting member operatively connected with each of said shaftsfor actuating said shafts, a unidirectional coupling operativelyassociated with said lifting members, and a single reciprocatory control1ever operatively associated with said coupling for rotating saidlifting members only in one direction of movement of said control leverby virtue of said unidirectional coupling.

4. In a heald shaft motion for hand looms, a plurality of heald shafts,a rotary lifting member operatively connected with each of said shaftsfor actuating said shafts, a unidirectional coupling operativelyassociated with said lifting members, said coupling including asprocket, a. free wheel hub arrangement included in said sprocket, and asingle reciprocatory control lever operatively associated.with saidsprocket for rotating said lifting members onlyin one dii'c'ction ofmovement of said control lever by virtue of said unidirectionalcoupling,

5. In a heald shaft motion ror hand looms, a plurality of heald shafts arotary lifting member operatively connected *with each 'of said shaftsfor actuating said shafts, a unidirectional coupling operativelyassociated with-said lift ing members, said coupling including asprocket, a free wheel hub arrangement included in :said sprocket, arotary pivot provided in :common with said lifting members and said freewheel hub 'arrangenrlexit for jointly rotating said members and saidfree wheel hub arrangement, and a single reciprocatcry control leveroperatively associated with said sprocket for rotating said liftingmembers only in one direction of movement or said control lever byvirtue of said unidirectional coupling. V r

' .PE'I'ER .ELORJANGIC.

EMIL zBORIAL.

